export function uuid() {
    function s4() {
      return Math.floor((1 + Math.random()) * 0x10000)
          .toString(16)
          .substring(1);
    }

    return (
        s4() +
        s4() +
        "-" +
        s4() +
        "-" +
        s4() +
        "-" +
        s4() +
        "-" +
        s4() +
        s4() +
        s4()
    );
  }